A motor driven grinding machine that utilizes an abrasive wheel, designed for precision grinding and refinishing of internal combustion engine valve seats. It consists essentially of a base, upright and grinding supports, work holder, electric motor(s), spindle(s), grinding head(s), gage(s), and any necessary accessories such as diamond dressers and abrasive wheel sets. It usually has a coolant system for wet grinding and it may be portable (disassembled in container base) for ease of transportation. Excludes GRINDING KIT, VALVE SEAT, ELECTRIC.